On 02.04.2021 19:42, Alexandru Ardelean wrote: > When dynamically allocating sysfs attributes, it's a good idea to call > sysfs_attr_init() on them to initialize lock_class_keys. > This change does that. > > The lock_class_keys are set when the CONFIG_DEBUG_LOCK_ALLOC symbol is > enabled. Which is [likely] one reason why I did not see this during > development. > > I also am not able to see this even with CONFIG_DEBUG_LOCK_ALLOC enabled, > so this may [likely] be reproduce-able on some system configurations. > > This was reported via: > https://lore.kernel.org/linux-iio/CA+U=DsrsvGgXEF30-vXuXS_k=-mjSjiBwEEzwKb1hJVn1P98OA@xxxxxxxxxxxxxx/T/#u > > Fixes: 15097c7a1adc ("iio: buffer: wrap all buffer attributes into iio_dev_attr") > Reported-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> > Signed-off-by: Alexandru Ardelean <aardelean@xxxxxxxxxxx> > --- > > @Marek: could you maybe test this on your setup? > > I haven't been able to reproduce this on mine. Works fine with this fix. Thanks! Tested-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> > Thanks > Alex > > drivers/iio/industrialio-buffer.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c > index ee5aab9d4a23..06b2ea087408 100644 > --- a/drivers/iio/industrialio-buffer.c > +++ b/drivers/iio/industrialio-buffer.c > @@ -1309,6 +1309,7 @@ static struct attribute *iio_buffer_wrap_attr(struct iio_buffer *buffer, > iio_attr->buffer = buffer; > memcpy(&iio_attr->dev_attr, dattr, sizeof(iio_attr->dev_attr)); > iio_attr->dev_attr.attr.name = kstrdup_const(attr->name, GFP_KERNEL); > + sysfs_attr_init(&iio_attr->dev_attr.attr); > > list_add(&iio_attr->l, &buffer->buffer_attr_list); > Best regards -- Marek Szyprowski, PhD Samsung R&D Institute Poland
